大括号显示

$$
\left\{  
             \begin{array}{**lr**}  
             x=\dfrac{3\pi}{2}(1+2t)\cos(\dfrac{3\pi}{2}(1+2t)), &  \\  
             y=s, & 0\leq s\leq L,|t|\leq1.\\  
             z=\dfrac{3\pi}{2}(1+2t)\sin(\dfrac{3\pi}{2}(1+2t)), &    
             \end{array}  
\right.  

$$\{\begin{array}{lr}x=\frac{3\pi }{2}(1+2t)\cos (\frac{3\pi }{2}(1+2t)),& \\ y=s,& 0\le s\le L,|t|\le 1.\\ z=\frac{3\pi }{2}(1+2t)\sin (\frac{3\pi }{2}(1+2t)),& \end{array}$$
对比括号一

\left\{  
\begin{array}{**rcl**}
    IF_{k}(\hat{t}_{k,m})=IF_{m}(\hat{t}_{k,m}), & \\
    IF_{k}(\hat{t}_{k,m}) \pm h= IF_{m}(\hat{t}_{k,m}) \pm h  , &\\
    \left |IF'_{k}(\hat{t}_{k,m} - IF'_{m}(\hat{t}_{k,m} \right |\geq d , &   
\end{array}
\right.  

$$\{\begin{array}{rc}I{F}_k({\hat{t}}_{k,m})=I{F}_m({\hat{t}}_{k,m}),& \\ I{F}_k({\hat{t}}_{k,m})\pm h=I{F}_m({\hat{t}}_{k,m})\pm h,& \\ \left|I{F}_k^{\prime }({\hat{t}}_{k,m}-I{F}_m^{\prime }({\hat{t}}_{k,m}\right|\ge d,& \end{array}$$
常用的三种大括号写法

$$ f(x)=\left\{
\begin{aligned}
x & = & \cos(t) \\
y & = & \sin(t) \\
z & = & \frac xy
\end{aligned}
\right.
$$

$$f(x)=\{\begin{array}{rlr}x& =& \cos (t)\\ y& =& \sin (t)\\ z& =& \frac{x}{y}\end{array}$$

$$ F^{HLLC}=\left\{
\begin{array}{rcl}
F_L       &      & {0      <      S_L}\\
F^*_L     &      & {S_L \leq 0 < S_M}\\
F^*_R     &      & {S_M \leq 0 < S_R}\\
F_R       &      & {S_R \leq 0}
\end{array} \right. $$

$$F^{HLLC}=\{\begin{array}{rcl}{F}_L& & 0<S_L\\ F_L^{\ast }& & S_L\le 0<S_M\\ F_R^{\ast }& & S_M\le 0<S_R\\ F_R& & S_R\le 0\end{array}$$

$$f(x)=
\begin{cases}
0& \text{x=0}\\
1& \text{x!=0}
\end{cases}$$
\end{CJK*}
\end{document}

$$f(x)=\{\begin{array}{ll}0& \text{x=0}\\ 1& \text{x!=0}\end{array}$$

$$
\begin{gathered}
\begin{matrix} 0 & 1 \\ 1 & 0 \end{matrix}
\quad
\begin{pmatrix} 0 & -i \\ i & 0 \end{pmatrix}
\quad
\begin{bmatrix} 0 & -1 \\ 1 & 0 \end{bmatrix}
\quad
\begin{Bmatrix} 1 & 0 \\ 0 & -1 \end{Bmatrix}
\quad
\begin{vmatrix} a & b \\ c & d \end{vmatrix}
\quad
\begin{Vmatrix} i & 0 \\ 0 & -i \end{Vmatrix}
\end{gathered}
$$

$$\begin{array}{c}\begin{array}{cc}0& 1\\ 1& 0\end{array}\left(\begin{array}{cc}0& -i\\ i& 0\end{array}\right)\left[\begin{array}{cc}0& -1\\ 1& 0\end{array}\right]\left\{\begin{array}{cc}1& 0\\ 0& -1\end{array}\right\}\left|\begin{array}{cc}a& b\\ c& d\end{array}\right|\Vert \begin{array}{cc}i& 0\\ 0& -i\end{array}\Vert \end{array}$$
功能 语法 显示
不好看

\frac{1}{2} 

$(\frac{1}{2})$
好一点

\left( \frac{1}{2} \right)

$\left ( \frac{1}{2} \right ) $
您可以使用\left和\right来显示不同的括号：
功能 语法 显示
圆括号，小括号

\left( \frac{a}{b} \right)

$\left(\frac{a}{b}\right)$
方括号，中括号

\left[ \frac{a}{b} \right]